ACKNOWLEDGMENT This thesis acknowledges the following people for their support and assistance: First, I would like to thank my advisor, Professor Un-Ku Moon, for allowing me to be part of his research group, and for supporting me financially. I learned alot from his wide knowledge of circuits. I also would like to thank my co-advisor, Professor Gábor C. Temes, for his assistance, and for his jo...

This paper presents a new structure of the discrete time 0-2 MASH sigma-delta modulator implemented with VCObased quantizer in the second stage. The proposed scheme enhances the linearity of the VCO based quantizer, meanwhile it takes advantage of the intrinsic DEM function and first order noise shaping in the second stage. Besides, the matching requirement is relaxed and the digital canceling ...

In this paper, a cascade Sigma-Delta (ΣΔ) Analog to Digital Converter (ADC) for multistandard radio receiver was presented. This converter is supposed to be able to support GSM, UMTS, Wifi and WiMAX communication standards. The Sigma-Delta modulator makes use of 4 bit quantizer and Data-Weighted-Averaging (DWA) technique to attain high linearity over a wide bandwidth. A top-down design methodol...

This paper presents a development of a wideband deltasigma modulator for fully digital GHz transmitters. The fully digital RF transmitter is developed as a promising solution for software defined radio (SDR) terminals and applications. The fully digital transmitter consists of a delta-sigma modulator, a highspeed multiplexer and a switching-mode power amplifier. The speed limitation of delta-si...

ABSTRACT In this thesis, a method of time-interleaving continuous-time delta-sigma modulators is investigated. The derivation of the modulator starting from a discrete-time timeinterleaved structure is presented. With various simplifications, the resulting modulator has only a single-path of integrators, making it robust to DC offsets. A third-order lowpass continuous-time time-interleaved delt...

The paper deals with a bandpass sigma-delta modulator (BP SDM), which is used for conversion of signal from capacitive pressure sensor. This approach is absolutely new and unique, because this kind of modulator is utilized only for wireless and video applications. The main advantage of BP SDM is due to its defined band. That is why it is resistant against offsets of its sub-circuits. Another im...

Solid state devices are used more and more to provide computerised control and sensing in high temperature environments. The market for electronics, in instrumentation and control systems in down-hole applications for petroleum exploration, requires increased performance from electronic components in terms of both duration and temperature. Substantial improvements in performance and cost of com...

In this paper, a alternative structure method for continuous time sigma delta modulator is presented. In this modulator for implementation of integrators in loop filter second generation current conveyors are employed. The modulator is designed in CMOS technology and features low power consumption (<2.8mW), low supply voltage (±1.65), wide dynamic range (>65db), and with 180khZ bandwidth. Simul...

A second order switched capacitor sigma-delta modulator operating at a supply voltage of 1 V is presented. This low supply voltage restricts the gate overdrive voltage available for switching transistors. The design relies on the elimination of critical switches by using a modified switched op amp for the integrator and novel switched half-supply and reference voltage generators. The design has...

A common architecture here unifies ordinary scalar deltasigma modulators, vector I/O delta-sigma modulators (including parallel banks of scalar ones), mismatch-shaping DACs, delta-sigma modulators incorporating mismatchshaping DACs in the conventional way, and something new: scalar or vector delta-sigma modulators incorporating spectral shaping of hardware mismatches as a natural and integral p...